____ he took part in the competition,he won a second prize.A.For the first timeB.At a timeC.At one timeD.the first time 请问为什么选D,求详解,再谢!

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____ he took part in the competition,he won a second prize.
A.For the first time
B.At a time
C.At one time
D.the first time 请问为什么选D,求详解,再谢!

for the first time 第一次,是个副词短语 不应该放在句首
At a time 此时 意义不对
At one time 曾经 同时 意义不对

the first time 作引导词,引导句子,和后面的主句构成主从复合句。